Catalyst System Efficiency Below Threshold
Catalyst System Efficiency Below Threshold The service engine soon light is on, and after scanning for codes I get a
Catalyst System Efficiency Below Threshold (Bank 1)
Catalyst System Efficiency Below Threshold (Bank 2)
Anyone know what this is? I would guess O2 sensor malfunction?
Mods are: Borla C/B, Lid, 80MM TB. Had mods on car for over 8 months with no light.
Any opinions?
Catalyst System Efficiency Below Threshold (Bank 1)
Catalyst System Efficiency Below Threshold (Bank 2)
Anyone know what this is? I would guess O2 sensor malfunction?
Mods are: Borla C/B, Lid, 80MM TB. Had mods on car for over 8 months with no light.
Any opinions?
Likely bad cats. Warranty on cats and PCM is 8/80, not 10/120 last time I checked. I was a service advisor at a chevy dealer so I know, but it may have changed in the last year or two.
Make sure you tune that car and possibly replace the front O2s, I suspect you are running rich and that is what kills the cats prematurely.
Make sure you tune that car and possibly replace the front O2s, I suspect you are running rich and that is what kills the cats prematurely.
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I believe it's a federal law, not local.
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On The Tree
Joined: Apr 2007
Posts: 148
Likes: 0
From: Northvale, NJ
Yes, it is Federal law 8/80 on all vehicles (for cats). If you have a defective cat and fall in this timeframe the dealer is violating the law.
My understanding is that Federal law protects the computer for 8/80 also.
My understanding is that Federal law protects the computer for 8/80 also.
I got the letter last yr explaining the cats to 10 yrs.
Fed law does cover cats to 8/80, ecm to 8/80 and maf to 8/80. I know BMW does anyway since I am a tech. These are covered due to emmissions.
nissan has problems with their cats and o2 sensors anyway. I am in the same shop as nissan. Those techs replace cats,02 sensors and TB everyday. I mean 2-3 a day.
Fed law does cover cats to 8/80, ecm to 8/80 and maf to 8/80. I know BMW does anyway since I am a tech. These are covered due to emmissions.
nissan has problems with their cats and o2 sensors anyway. I am in the same shop as nissan. Those techs replace cats,02 sensors and TB everyday. I mean 2-3 a day.
I was thinking the same thing as well.It is odd that both banks are getting the codes at the same time.That does USUALLY indicate something else is wrong further upstream.
I have this same CEL code. I installed some brand new 1 3/4 ARH + catted Y. Like 2 months ago. MTI tuned it. So my cats are dead? 
If it's not hurting my car what do I need to do to just get rid of the CEL. How do you gut the cats? Or do I even need to?
I had the CEL deleted last week and it came back on yesterday. Thanks
If it's not hurting my car what do I need to do to just get rid of the CEL. How do you gut the cats? Or do I even need to? I had the CEL deleted last week and it came back on yesterday. Thanks
On The Tree
Joined: Apr 2007
Posts: 148
Likes: 0
From: Northvale, NJ
You guys and the removing/gutting the cats drive me nuts. If I tried that in my state I'd be strung up by the b@lls.
New DS cat under warranty fixed my problem.
Of course, they sent me away with an exhaust leak once, then ~almost~ twice when I returned to have the problem corrected and they denied it existed. But that's a different story.
New DS cat under warranty fixed my problem.
Of course, they sent me away with an exhaust leak once, then ~almost~ twice when I returned to have the problem corrected and they denied it existed. But that's a different story.
I have this same CEL code. I installed some brand new 1 3/4 ARH + catted Y. Like 2 months ago. MTI tuned it. So my cats are dead? If it's not hurting my car what do I need to do to just get rid of the CEL. How do you gut the cats? Or do I even need to?
I had the CEL deleted last week and it came back on yesterday. Thanks
If it's not hurting my car what do I need to do to just get rid of the CEL. How do you gut the cats? Or do I even need to? I had the CEL deleted last week and it came back on yesterday. Thanks
If yours is doing the same thing I would just get o2 sims to get rid of the code. It won't hurt anything as long as they are not clogged.
